Peddle yourself around the city on bright-orange bikes found at over 250 stations. After registering on the website or the app (Bike Itaú), you can buy a monthly pass (R$10) or a day pass (R$5). Instructions are available in English at the stations and the bikes are released via mobile phone or app.
Many (but not all) stations also have a pay-on-the-spot option for a day pass. After you swipe your credit card you'll be given a code that you'll use to release any of the bikes. The first 60 minutes won't cost extra; after that it's R$5 per hour, though you can make an unlimited number of checkouts during your 24-hour day pass (or monthly pass).